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testo 635 - the working standard for temperature and humidity measurements
The testo 635 thermo hygrometer offers quick and easy humidity, equilibrium moisture, and pressure dew point measurements. Compatible with wireless probes, the testo 635 thermo hygrometer combines advanced features with proven reliability to deliver measuring confidence in the most demanding applications.
testo 435 - The new all-rounder
testo 435 is the new multi-function measuring instrument which analyzes Indoor Air Quality to tune air conditioning systems. The new IAQ probe measures Indoor Air Quality using the parameters CO2, % relative humidity and ambient air temperature. Absolute pressure is also available. The degree of turbulence probe is used to achieve an objective assessment of ambient air flow. The new Lux probe measures light conditions in the workplace and the repetition frequency of monitors. The surface probe and air moisture probe are used to show where dewpoint has been exceeded and mould has developed. The heat transfer coefficient (U-value) is measured using the U-value temperature probe and a radio probe. Temperature and humidity measurement are built-in in the new thermal probe. In this way, flow speed, volume flow, air humidity and air temperature can be measured in one procedure. Different measurement principles (hot wire, vane and Pitot tube measurement) can be used depending on flow speed and application.
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